bsdlabel.c revision 149061 
1/*
2 * Copyright (c) 1994, 1995 Gordon W. Ross
3 * Copyright (c) 1994 Theo de Raadt
4 * All rights reserved.
5 * Copyright (c) 1987, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Symmetric Computer Systems.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the University of
22 *	California, Berkeley and its contributors.
23 *      This product includes software developed by Theo de Raadt.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 *	from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
41 */
42
43#if 0
44#ifndef lint
45static const char copyright[] =
46"@(#) Copyright (c) 1987, 1993\n\
47	The Regents of the University of California.  All rights reserved.\n";
48#endif /* not lint */
49
50#ifndef lint
51static char sccsid[] = "@(#)disklabel.c	8.2 (Berkeley) 1/7/94";
52/* from static char sccsid[] = "@(#)disklabel.c	1.2 (Symmetric) 11/28/85"; */
53#endif /* not lint */
54#endif
55#include <sys/cdefs.h>
56__FBSDID("$FreeBSD: head/sbin/bsdlabel/bsdlabel.c 149061 2005-08-14 22:46:50Z iedowse $");
57
58#include <sys/param.h>
59#include <stdint.h>
60#include <sys/file.h>
61#include <sys/stat.h>
62#include <sys/wait.h>
63#include <sys/disk.h>
64#define DKTYPENAMES
65#define FSTYPENAMES
66#include <sys/disklabel.h>
67
68#include <unistd.h>
69#include <string.h>
70#include <stdio.h>
71#include <libgeom.h>
72#include <stdlib.h>
73#include <signal.h>
74#include <stdarg.h>
75#include <ctype.h>
76#include <err.h>
77#include <errno.h>
78
79#include "pathnames.h"
80
81static void	makelabel(const char *, struct disklabel *);
82static int	writelabel(void);
83static int	readlabel(int flag);
84static void	display(FILE *, const struct disklabel *);
85static int	edit(void);
86static int	editit(void);
87static void	fixlabel(struct disklabel *);
88static char	*skip(char *);
89static char	*word(char *);
90static int	getasciilabel(FILE *, struct disklabel *);
91static int	getasciipartspec(char *, struct disklabel *, int, int);
92static int	checklabel(struct disklabel *);
93static void	usage(void);
94static struct disklabel *getvirginlabel(void);
95
96#define	DEFEDITOR	_PATH_VI
97
98static char	*dkname;
99static char	*specname;
100static char	tmpfil[] = PATH_TMPFILE;
101
102static struct	disklabel lab;
103static u_char	bootarea[BBSIZE];
104static off_t	mediasize;
105static u_int	secsize;
106static char	blank[] = "";
107static char	unknown[] = "unknown";
108
109#define MAX_PART ('z')
110#define MAX_NUM_PARTS (1 + MAX_PART - 'a')
111static char    part_size_type[MAX_NUM_PARTS];
112static char    part_offset_type[MAX_NUM_PARTS];
113static int     part_set[MAX_NUM_PARTS];
114
115static int	installboot;	/* non-zero if we should install a boot program */
116static int	allfields;	/* present all fields in edit */
117static char const *xxboot;	/* primary boot */
118
119static off_t mbroffset;
120#ifndef LABELSECTOR
121#define LABELSECTOR -1
122#endif
123#ifndef LABELOFFSET
124#define LABELOFFSET -1
125#endif
126static int labelsoffset = LABELSECTOR;
127static int labeloffset = LABELOFFSET;
128static int bbsize = BBSIZE;
129static int alphacksum =
130#if defined(__alpha__)
131	1;
132#else
133	0;
134#endif
135
136enum	{
137	UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
138} op = UNSPEC;
139
140
141static int	disable_write;   /* set to disable writing to disk label */
142static int	is_file;	/* work on a file (abs. pathname), "-f" opt. */
143
144int
145main(int argc, char *argv[])
146{
147	FILE *t;
148	int ch, error = 0;
149	char const *name = 0;
150
151	while ((ch = getopt(argc, argv, "ABb:efm:nRrs:w")) != -1)
152		switch (ch) {
153			case 'A':
154				allfields = 1;
155				break;
156			case 'B':
157				++installboot;
158				break;
159			case 'b':
160				xxboot = optarg;
161				break;
162			case 'f':
163				is_file=1;
164				break;
165			case 'm':
166				if (!strcmp(optarg, "i386") ||
167				    !strcmp(optarg, "amd64") ||
168				    !strcmp(optarg, "ia64") ||
169				    !strcmp(optarg, "pc98")) {
170					labelsoffset = 1;
171					labeloffset = 0;
172					bbsize = 8192;
173					alphacksum = 0;
174				} else if (!strcmp(optarg, "alpha")) {
175					labelsoffset = 0;
176					labeloffset = 64;
177					bbsize = 8192;
178					alphacksum = 1;
179				} else {
180					errx(1, "Unsupported architecture");
181				}
182				break;
183			case 'n':
184				disable_write = 1;
185				break;
186			case 'R':
187				if (op != UNSPEC)
188					usage();
189				op = RESTORE;
190				break;
191			case 'e':
192				if (op != UNSPEC)
193					usage();
194				op = EDIT;
195				break;
196			case 'r':
197				/*
198				 * We accept and ignode -r for compatibility with
199				 * historically disklabel usage.
200				 */
201				break;
202			case 'w':
203				if (op != UNSPEC)
204					usage();
205				op = WRITE;
206				break;
207			case '?':
208			default:
209				usage();
210		}
211	argc -= optind;
212	argv += optind;
213
214	if (argc < 1)
215		usage();
216	if (labelsoffset < 0 || labeloffset < 0)
217		errx(1, "a -m <architecture> option must be specified");
218
219	/* Figure out the names of the thing we're working on */
220	if (is_file) {
221		dkname = specname = argv[0];
222	} else if (argv[0][0] != '/') {
223		dkname = argv[0];
224		asprintf(&specname, "%s%s", _PATH_DEV, argv[0]);
225	} else if (strncmp(argv[0], _PATH_DEV, strlen(_PATH_DEV)) == 0) {
226		dkname = argv[0] + strlen(_PATH_DEV);
227		specname = argv[0];
228	} else {
229		dkname = strrchr(argv[0], '/');
230		dkname++;
231		specname = argv[0];
232	}
233
234	if (installboot && op == UNSPEC)
235		op = WRITEBOOT;
236	else if (op == UNSPEC)
237		op = READ;
238
239	switch(op) {
240
241	case UNSPEC:
242		break;
243
244	case EDIT:
245		if (argc != 1)
246			usage();
247		readlabel(1);
248		fixlabel(&lab);
249		error = edit();
250		break;
251
252	case READ:
253		if (argc != 1)
254			usage();
255		readlabel(1);
256		display(stdout, NULL);
257		error = checklabel(NULL);
258		break;
259
260	case RESTORE:
261		if (argc != 2)
262			usage();
263		if (!(t = fopen(argv[1], "r")))
264			err(4, "fopen %s", argv[1]);
265		readlabel(0);
266		if (!getasciilabel(t, &lab))
267			exit(1);
268		error = writelabel();
269		break;
270
271	case WRITE:
272		if (argc == 2)
273			name = argv[1];
274		else if (argc == 1)
275			name = "auto";
276		else
277			usage();
278		readlabel(0);
279		makelabel(name, &lab);
280		fixlabel(&lab);
281		if (checklabel(NULL) == 0)
282			error = writelabel();
283		break;
284
285	case WRITEBOOT:
286
287		readlabel(1);
288		fixlabel(&lab);
289		if (argc == 2)
290			makelabel(argv[1], &lab);
291		if (checklabel(NULL) == 0)
292			error = writelabel();
293		break;
294	}
295	exit(error);
296}
297
298static void
299fixlabel(struct disklabel *lp)
300{
301	struct partition *dp;
302	int i;
303
304	for (i = 0; i < MAXPARTITIONS; i++) {
305		if (i == RAW_PART)
306			continue;
307		if (lp->d_partitions[i].p_size)
308			return;
309	}
310
311	dp = &lp->d_partitions[0];
312	dp->p_offset = BBSIZE / secsize;
313	dp->p_size = lp->d_secperunit - dp->p_offset;
314}
315
316/*
317 * Construct a prototype disklabel from /etc/disktab.
318 */
319static void
320makelabel(const char *type, struct disklabel *lp)
321{
322	struct disklabel *dp;
323
324	if (strcmp(type, "auto") == 0)
325		dp = getvirginlabel();
326	else
327		dp = getdiskbyname(type);
328	if (dp == NULL)
329		errx(1, "%s: unknown disk type", type);
330	*lp = *dp;
331	bzero(lp->d_packname, sizeof(lp->d_packname));
332}
333
334static void
335readboot(void)
336{
337	int fd, i;
338	struct stat st;
339	uint64_t *p;
340
341	if (xxboot == NULL)
342		xxboot = "/boot/boot";
343	fd = open(xxboot, O_RDONLY);
344	if (fd < 0)
345		err(1, "cannot open %s", xxboot);
346	fstat(fd, &st);
347	if (alphacksum && st.st_size <= BBSIZE - 512) {
348		i = read(fd, bootarea + 512, st.st_size);
349		if (i != st.st_size)
350			err(1, "read error %s", xxboot);
351
352		/*
353		 * Set the location and length so SRM can find the
354		 * boot blocks.
355		 */
356		p = (uint64_t *)bootarea;
357		p[60] = (st.st_size + secsize - 1) / secsize;
358		p[61] = 1;
359		p[62] = 0;
360		return;
361	} else if ((!alphacksum) && st.st_size <= BBSIZE) {
362		i = read(fd, bootarea, st.st_size);
363		if (i != st.st_size)
364			err(1, "read error %s", xxboot);
365		return;
366	}
367	errx(1, "boot code %s is wrong size", xxboot);
368}
369
370static int
371writelabel(void)
372{
373	uint64_t *p, sum;
374	int i, fd;
375	struct gctl_req *grq;
376	char const *errstr;
377	struct disklabel *lp = &lab;
378
379	if (disable_write) {
380		warnx("write to disk label supressed - label was as follows:");
381		display(stdout, NULL);
382		return (0);
383	}
384
385	lp->d_magic = DISKMAGIC;
386	lp->d_magic2 = DISKMAGIC;
387	lp->d_checksum = 0;
388	lp->d_checksum = dkcksum(lp);
389	if (installboot)
390		readboot();
391	for (i = 0; i < lab.d_npartitions; i++)
392		if (lab.d_partitions[i].p_size)
393			lab.d_partitions[i].p_offset += mbroffset;
394	bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * secsize,
395	    lp);
396	if (alphacksum) {
397		/* Generate the bootblock checksum for the SRM console.  */
398		for (p = (uint64_t *)bootarea, i = 0, sum = 0; i < 63; i++)
399			sum += p[i];
400		p[63] = sum;
401	}
402
403	fd = open(specname, O_RDWR);
404	if (fd < 0) {
405		if (is_file) {
406			warn("cannot open file %s for writing label", specname);
407			return(1);
408		}
409		grq = gctl_get_handle();
410		gctl_ro_param(grq, "verb", -1, "write label");
411		gctl_ro_param(grq, "class", -1, "BSD");
412		gctl_ro_param(grq, "geom", -1, dkname);
413		gctl_ro_param(grq, "label", 148+16*8,
414			bootarea + labeloffset + labelsoffset * secsize);
415		errstr = gctl_issue(grq);
416		if (errstr != NULL) {
417			warnx("%s", errstr);
418			gctl_free(grq);
419			return(1);
420		}
421		gctl_free(grq);
422		if (installboot) {
423			grq = gctl_get_handle();
424			gctl_ro_param(grq, "verb", -1, "write bootcode");
425			gctl_ro_param(grq, "class", -1, "BSD");
426			gctl_ro_param(grq, "geom", -1, dkname);
427			gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
428			errstr = gctl_issue(grq);
429			if (errstr != NULL) {
430				warnx("%s", errstr);
431				gctl_free(grq);
432				return (1);
433			}
434			gctl_free(grq);
435		}
436	} else {
437		if (write(fd, bootarea, bbsize) != bbsize) {
438			warn("write %s", specname);
439			close (fd);
440			return (1);
441		}
442		close (fd);
443	}
444	return (0);
445}
446
447static void
448get_file_parms(int f)
449{
450	int i;
451	struct stat sb;
452
453	if (fstat(f, &sb) != 0)
454		err(4, "fstat failed");
455	i = sb.st_mode & S_IFMT;
456	if (i != S_IFREG && i != S_IFLNK)
457		errx(4, "%s is not a valid file or link", specname);
458	secsize = DEV_BSIZE;
459	mediasize = sb.st_size;
460}
461
462/*
463 * Fetch disklabel for disk.
464 * Use ioctl to get label unless -r flag is given.
465 */
466static int
467readlabel(int flag)
468{
469	int f, i;
470	int error;
471	struct gctl_req *grq;
472	char const *errstr;
473
474	f = open(specname, O_RDONLY);
475	if (f < 0)
476		err(1, specname);
477	if (is_file)
478		get_file_parms(f);
479	else if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
480	    (ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) {
481		err(4, "cannot get disk geometry");
482	}
483	if (mediasize > (off_t)0xffffffff * secsize)
484		errx(1,
485		    "disks with more than 2^32-1 sectors are not supported");
486	(void)lseek(f, (off_t)0, SEEK_SET);
487	if (read(f, bootarea, BBSIZE) != BBSIZE)
488		err(4, "%s read", specname);
489	close (f);
490	error = bsd_disklabel_le_dec(
491	    bootarea + (labeloffset + labelsoffset * secsize),
492	    &lab, MAXPARTITIONS);
493	if (flag && error)
494		errx(1, "%s: no valid label found", specname);
495
496	grq = gctl_get_handle();
497	gctl_ro_param(grq, "verb", -1, "read mbroffset");
498	gctl_ro_param(grq, "class", -1, "BSD");
499	gctl_ro_param(grq, "geom", -1, dkname);
500	gctl_rw_param(grq, "mbroffset", sizeof(mbroffset), &mbroffset);
501	errstr = gctl_issue(grq);
502	if (errstr != NULL) {
503		mbroffset = 0;
504		gctl_free(grq);
505		return (error);
506	}
507	mbroffset /= lab.d_secsize;
508	if (lab.d_partitions[RAW_PART].p_offset == mbroffset)
509		for (i = 0; i < lab.d_npartitions; i++)
510			if (lab.d_partitions[i].p_size)
511				lab.d_partitions[i].p_offset -= mbroffset;
512	return (error);
513}
514
515
516static void
517display(FILE *f, const struct disklabel *lp)
518{
519	int i, j;
520	const struct partition *pp;
521
522	if (lp == NULL)
523		lp = &lab;
524
525	fprintf(f, "# %s:\n", specname);
526	if (allfields) {
527		if (lp->d_type < DKMAXTYPES)
528			fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
529		else
530			fprintf(f, "type: %u\n", lp->d_type);
531		fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
532			lp->d_typename);
533		fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
534			lp->d_packname);
535		fprintf(f, "flags:");
536		if (lp->d_flags & D_REMOVABLE)
537			fprintf(f, " removeable");
538		if (lp->d_flags & D_ECC)
539			fprintf(f, " ecc");
540		if (lp->d_flags & D_BADSECT)
541			fprintf(f, " badsect");
542		fprintf(f, "\n");
543		fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
544		fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
545		fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
546		fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
547		fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
548		fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
549		fprintf(f, "rpm: %u\n", lp->d_rpm);
550		fprintf(f, "interleave: %u\n", lp->d_interleave);
551		fprintf(f, "trackskew: %u\n", lp->d_trackskew);
552		fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
553		fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
554		    (u_long)lp->d_headswitch);
555		fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
556		    (u_long)lp->d_trkseek);
557		fprintf(f, "drivedata: ");
558		for (i = NDDATA - 1; i >= 0; i--)
559			if (lp->d_drivedata[i])
560				break;
561		if (i < 0)
562			i = 0;
563		for (j = 0; j <= i; j++)
564			fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
565		fprintf(f, "\n\n");
566	}
567	fprintf(f, "%u partitions:\n", lp->d_npartitions);
568	fprintf(f,
569	    "#        size   offset    fstype   [fsize bsize bps/cpg]\n");
570	pp = lp->d_partitions;
571	for (i = 0; i < lp->d_npartitions; i++, pp++) {
572		if (pp->p_size) {
573			fprintf(f, "  %c: %8lu %8lu  ", 'a' + i,
574			   (u_long)pp->p_size, (u_long)pp->p_offset);
575			if (pp->p_fstype < FSMAXTYPES)
576				fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
577			else
578				fprintf(f, "%8d", pp->p_fstype);
579			switch (pp->p_fstype) {
580
581			case FS_UNUSED:				/* XXX */
582				fprintf(f, "    %5lu %5lu %5.5s ",
583				    (u_long)pp->p_fsize,
584				    (u_long)(pp->p_fsize * pp->p_frag), "");
585				break;
586
587			case FS_BSDFFS:
588				fprintf(f, "    %5lu %5lu %5u ",
589				    (u_long)pp->p_fsize,
590				    (u_long)(pp->p_fsize * pp->p_frag),
591				    pp->p_cpg);
592				break;
593
594			case FS_BSDLFS:
595				fprintf(f, "    %5lu %5lu %5d",
596				    (u_long)pp->p_fsize,
597				    (u_long)(pp->p_fsize * pp->p_frag),
598				    pp->p_cpg);
599				break;
600
601			default:
602				fprintf(f, "%20.20s", "");
603				break;
604			}
605			if (i == RAW_PART) {
606				fprintf(f, "  # \"raw\" part, don't edit");
607			}
608			fprintf(f, "\n");
609		}
610	}
611	fflush(f);
612}
613
614static int
615edit(void)
616{
617	int c, fd;
618	struct disklabel label;
619	FILE *fp;
620
621	if ((fd = mkstemp(tmpfil)) == -1 ||
622	    (fp = fdopen(fd, "w")) == NULL) {
623		warnx("can't create %s", tmpfil);
624		return (1);
625	}
626	display(fp, NULL);
627	fclose(fp);
628	for (;;) {
629		if (!editit())
630			break;
631		fp = fopen(tmpfil, "r");
632		if (fp == NULL) {
633			warnx("can't reopen %s for reading", tmpfil);
634			break;
635		}
636		bzero((char *)&label, sizeof(label));
637		c = getasciilabel(fp, &label);
638		fclose(fp);
639		if (c) {
640			lab = label;
641			if (writelabel() == 0) {
642				(void) unlink(tmpfil);
643				return (0);
644			}
645		}
646		printf("re-edit the label? [y]: ");
647		fflush(stdout);
648		c = getchar();
649		if (c != EOF && c != (int)'\n')
650			while (getchar() != (int)'\n')
651				;
652		if  (c == (int)'n')
653			break;
654	}
655	(void) unlink(tmpfil);
656	return (1);
657}
658
659static int
660editit(void)
661{
662	int pid, xpid;
663	int locstat, omask;
664	const char *ed;
665
666	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
667	while ((pid = fork()) < 0) {
668		if (errno == EPROCLIM) {
669			warnx("you have too many processes");
670			return(0);
671		}
672		if (errno != EAGAIN) {
673			warn("fork");
674			return(0);
675		}
676		sleep(1);
677	}
678	if (pid == 0) {
679		sigsetmask(omask);
680		setgid(getgid());
681		setuid(getuid());
682		if ((ed = getenv("EDITOR")) == (char *)0)
683			ed = DEFEDITOR;
684		execlp(ed, ed, tmpfil, (char *)0);
685		err(1, "%s", ed);
686	}
687	while ((xpid = wait(&locstat)) >= 0)
688		if (xpid == pid)
689			break;
690	sigsetmask(omask);
691	return(!locstat);
692}
693
694static char *
695skip(char *cp)
696{
697
698	while (*cp != '\0' && isspace(*cp))
699		cp++;
700	if (*cp == '\0' || *cp == '#')
701		return (NULL);
702	return (cp);
703}
704
705static char *
706word(char *cp)
707{
708	char c;
709
710	while (*cp != '\0' && !isspace(*cp) && *cp != '#')
711		cp++;
712	if ((c = *cp) != '\0') {
713		*cp++ = '\0';
714		if (c != '#')
715			return (skip(cp));
716	}
717	return (NULL);
718}
719
720/*
721 * Read an ascii label in from fd f,
722 * in the same format as that put out by display(),
723 * and fill in lp.
724 */
725static int
726getasciilabel(FILE *f, struct disklabel *lp)
727{
728	char *cp;
729	const char **cpp;
730	u_int part;
731	char *tp, line[BUFSIZ];
732	u_long v;
733	int lineno = 0, errors = 0;
734	int i;
735
736	makelabel("auto", lp);
737	bzero(&part_set, sizeof(part_set));
738	bzero(&part_size_type, sizeof(part_size_type));
739	bzero(&part_offset_type, sizeof(part_offset_type));
740	lp->d_bbsize = BBSIZE;				/* XXX */
741	lp->d_sbsize = 0;				/* XXX */
742	while (fgets(line, sizeof(line) - 1, f)) {
743		lineno++;
744		if ((cp = index(line,'\n')) != 0)
745			*cp = '\0';
746		cp = skip(line);
747		if (cp == NULL)
748			continue;
749		tp = index(cp, ':');
750		if (tp == NULL) {
751			fprintf(stderr, "line %d: syntax error\n", lineno);
752			errors++;
753			continue;
754		}
755		*tp++ = '\0', tp = skip(tp);
756		if (!strcmp(cp, "type")) {
757			if (tp == NULL)
758				tp = unknown;
759			cpp = dktypenames;
760			for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
761				if (*cpp && !strcmp(*cpp, tp)) {
762					lp->d_type = cpp - dktypenames;
763					break;
764				}
765			if (cpp < &dktypenames[DKMAXTYPES])
766				continue;
767			v = strtoul(tp, NULL, 10);
768			if (v >= DKMAXTYPES)
769				fprintf(stderr, "line %d:%s %lu\n", lineno,
770				    "Warning, unknown disk type", v);
771			lp->d_type = v;
772			continue;
773		}
774		if (!strcmp(cp, "flags")) {
775			for (v = 0; (cp = tp) && *cp != '\0';) {
776				tp = word(cp);
777				if (!strcmp(cp, "removeable"))
778					v |= D_REMOVABLE;
779				else if (!strcmp(cp, "ecc"))
780					v |= D_ECC;
781				else if (!strcmp(cp, "badsect"))
782					v |= D_BADSECT;
783				else {
784					fprintf(stderr,
785					    "line %d: %s: bad flag\n",
786					    lineno, cp);
787					errors++;
788				}
789			}
790			lp->d_flags = v;
791			continue;
792		}
793		if (!strcmp(cp, "drivedata")) {
794			for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
795				lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
796				tp = word(cp);
797			}
798			continue;
799		}
800		if (sscanf(cp, "%lu partitions", &v) == 1) {
801			if (v == 0 || v > MAXPARTITIONS) {
802				fprintf(stderr,
803				    "line %d: bad # of partitions\n", lineno);
804				lp->d_npartitions = MAXPARTITIONS;
805				errors++;
806			} else
807				lp->d_npartitions = v;
808			continue;
809		}
810		if (tp == NULL)
811			tp = blank;
812		if (!strcmp(cp, "disk")) {
813			strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
814			continue;
815		}
816		if (!strcmp(cp, "label")) {
817			strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
818			continue;
819		}
820		if (!strcmp(cp, "bytes/sector")) {
821			v = strtoul(tp, NULL, 10);
822			if (v == 0 || (v % DEV_BSIZE) != 0) {
823				fprintf(stderr,
824				    "line %d: %s: bad sector size\n",
825				    lineno, tp);
826				errors++;
827			} else
828				lp->d_secsize = v;
829			continue;
830		}
831		if (!strcmp(cp, "sectors/track")) {
832			v = strtoul(tp, NULL, 10);
833#if (ULONG_MAX != 0xffffffffUL)
834			if (v == 0 || v > 0xffffffff)
835#else
836			if (v == 0)
837#endif
838			{
839				fprintf(stderr, "line %d: %s: bad %s\n",
840				    lineno, tp, cp);
841				errors++;
842			} else
843				lp->d_nsectors = v;
844			continue;
845		}
846		if (!strcmp(cp, "sectors/cylinder")) {
847			v = strtoul(tp, NULL, 10);
848			if (v == 0) {
849				fprintf(stderr, "line %d: %s: bad %s\n",
850				    lineno, tp, cp);
851				errors++;
852			} else
853				lp->d_secpercyl = v;
854			continue;
855		}
856		if (!strcmp(cp, "tracks/cylinder")) {
857			v = strtoul(tp, NULL, 10);
858			if (v == 0) {
859				fprintf(stderr, "line %d: %s: bad %s\n",
860				    lineno, tp, cp);
861				errors++;
862			} else
863				lp->d_ntracks = v;
864			continue;
865		}
866		if (!strcmp(cp, "cylinders")) {
867			v = strtoul(tp, NULL, 10);
868			if (v == 0) {
869				fprintf(stderr, "line %d: %s: bad %s\n",
870				    lineno, tp, cp);
871				errors++;
872			} else
873				lp->d_ncylinders = v;
874			continue;
875		}
876		if (!strcmp(cp, "sectors/unit")) {
877			v = strtoul(tp, NULL, 10);
878			if (v == 0) {
879				fprintf(stderr, "line %d: %s: bad %s\n",
880				    lineno, tp, cp);
881				errors++;
882			} else
883				lp->d_secperunit = v;
884			continue;
885		}
886		if (!strcmp(cp, "rpm")) {
887			v = strtoul(tp, NULL, 10);
888			if (v == 0 || v > USHRT_MAX) {
889				fprintf(stderr, "line %d: %s: bad %s\n",
890				    lineno, tp, cp);
891				errors++;
892			} else
893				lp->d_rpm = v;
894			continue;
895		}
896		if (!strcmp(cp, "interleave")) {
897			v = strtoul(tp, NULL, 10);
898			if (v == 0 || v > USHRT_MAX) {
899				fprintf(stderr, "line %d: %s: bad %s\n",
900				    lineno, tp, cp);
901				errors++;
902			} else
903				lp->d_interleave = v;
904			continue;
905		}
906		if (!strcmp(cp, "trackskew")) {
907			v = strtoul(tp, NULL, 10);
908			if (v > USHRT_MAX) {
909				fprintf(stderr, "line %d: %s: bad %s\n",
910				    lineno, tp, cp);
911				errors++;
912			} else
913				lp->d_trackskew = v;
914			continue;
915		}
916		if (!strcmp(cp, "cylinderskew")) {
917			v = strtoul(tp, NULL, 10);
918			if (v > USHRT_MAX) {
919				fprintf(stderr, "line %d: %s: bad %s\n",
920				    lineno, tp, cp);
921				errors++;
922			} else
923				lp->d_cylskew = v;
924			continue;
925		}
926		if (!strcmp(cp, "headswitch")) {
927			v = strtoul(tp, NULL, 10);
928			lp->d_headswitch = v;
929			continue;
930		}
931		if (!strcmp(cp, "track-to-track seek")) {
932			v = strtoul(tp, NULL, 10);
933			lp->d_trkseek = v;
934			continue;
935		}
936		/* the ':' was removed above */
937		if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
938			fprintf(stderr,
939			    "line %d: %s: Unknown disklabel field\n", lineno,
940			    cp);
941			errors++;
942			continue;
943		}
944
945		/* Process a partition specification line. */
946		part = *cp - 'a';
947		if (part >= lp->d_npartitions) {
948			fprintf(stderr,
949			    "line %d: partition name out of range a-%c: %s\n",
950			    lineno, 'a' + lp->d_npartitions - 1, cp);
951			errors++;
952			continue;
953		}
954		part_set[part] = 1;
955
956		if (getasciipartspec(tp, lp, part, lineno) != 0) {
957			errors++;
958			break;
959		}
960	}
961	errors += checklabel(lp);
962	return (errors == 0);
963}
964
965#define NXTNUM(n) do { \
966	if (tp == NULL) { \
967		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
968		return (1); \
969	} else { \
970		cp = tp, tp = word(cp); \
971		(n) = strtoul(cp, NULL, 10); \
972	} \
973} while (0)
974
975/* retain 1 character following number */
976#define NXTWORD(w,n) do { \
977	if (tp == NULL) { \
978		fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
979		return (1); \
980	} else { \
981		char *tmp; \
982		cp = tp, tp = word(cp); \
983		(n) = strtoul(cp, &tmp, 10); \
984		if (tmp) (w) = *tmp; \
985	} \
986} while (0)
987
988/*
989 * Read a partition line into partition `part' in the specified disklabel.
990 * Return 0 on success, 1 on failure.
991 */
992static int
993getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
994{
995	struct partition *pp;
996	char *cp;
997	const char **cpp;
998	u_long v;
999
1000	pp = &lp->d_partitions[part];
1001	cp = NULL;
1002
1003	v = 0;
1004	NXTWORD(part_size_type[part],v);
1005	if (v == 0 && part_size_type[part] != '*') {
1006		fprintf(stderr,
1007		    "line %d: %s: bad partition size\n", lineno, cp);
1008		return (1);
1009	}
1010	pp->p_size = v;
1011
1012	v = 0;
1013	NXTWORD(part_offset_type[part],v);
1014	if (v == 0 && part_offset_type[part] != '*' &&
1015	    part_offset_type[part] != '\0') {
1016		fprintf(stderr,
1017		    "line %d: %s: bad partition offset\n", lineno, cp);
1018		return (1);
1019	}
1020	pp->p_offset = v;
1021	if (tp == NULL) {
1022		fprintf(stderr, "line %d: missing file system type\n", lineno);
1023		return (1);
1024	}
1025	cp = tp, tp = word(cp);
1026	for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1027		if (*cpp && !strcmp(*cpp, cp))
1028			break;
1029	if (*cpp != NULL) {
1030		pp->p_fstype = cpp - fstypenames;
1031	} else {
1032		if (isdigit(*cp))
1033			v = strtoul(cp, NULL, 10);
1034		else
1035			v = FSMAXTYPES;
1036		if (v >= FSMAXTYPES) {
1037			fprintf(stderr,
1038			    "line %d: Warning, unknown file system type %s\n",
1039			    lineno, cp);
1040			v = FS_UNUSED;
1041		}
1042		pp->p_fstype = v;
1043	}
1044
1045	switch (pp->p_fstype) {
1046	case FS_UNUSED:
1047	case FS_BSDFFS:
1048	case FS_BSDLFS:
1049		/* accept defaults for fsize/frag/cpg */
1050		if (tp) {
1051			NXTNUM(pp->p_fsize);
1052			if (pp->p_fsize == 0)
1053				break;
1054			NXTNUM(v);
1055			pp->p_frag = v / pp->p_fsize;
1056			if (tp != NULL)
1057				NXTNUM(pp->p_cpg);
1058		}
1059		/* else default to 0's */
1060		break;
1061	default:
1062		break;
1063	}
1064	return (0);
1065}
1066
1067/*
1068 * Check disklabel for errors and fill in
1069 * derived fields according to supplied values.
1070 */
1071static int
1072checklabel(struct disklabel *lp)
1073{
1074	struct partition *pp;
1075	int i, errors = 0;
1076	char part;
1077	u_long base_offset, needed, total_size, total_percent, current_offset;
1078	long free_space;
1079	int seen_default_offset;
1080	int hog_part;
1081	int j;
1082	struct partition *pp2;
1083
1084	if (lp == NULL)
1085		lp = &lab;
1086
1087	if (allfields) {
1088
1089		if (lp->d_secsize == 0) {
1090			fprintf(stderr, "sector size 0\n");
1091			return (1);
1092		}
1093		if (lp->d_nsectors == 0) {
1094			fprintf(stderr, "sectors/track 0\n");
1095			return (1);
1096		}
1097		if (lp->d_ntracks == 0) {
1098			fprintf(stderr, "tracks/cylinder 0\n");
1099			return (1);
1100		}
1101		if  (lp->d_ncylinders == 0) {
1102			fprintf(stderr, "cylinders/unit 0\n");
1103			errors++;
1104		}
1105		if (lp->d_rpm == 0)
1106			warnx("revolutions/minute 0");
1107		if (lp->d_secpercyl == 0)
1108			lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1109		if (lp->d_secperunit == 0)
1110			lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1111		if (lp->d_bbsize == 0) {
1112			fprintf(stderr, "boot block size 0\n");
1113			errors++;
1114		} else if (lp->d_bbsize % lp->d_secsize)
1115			warnx("boot block size %% sector-size != 0");
1116		if (lp->d_npartitions > MAXPARTITIONS)
1117			warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1118			    (u_long)lp->d_npartitions, MAXPARTITIONS);
1119	} else {
1120		struct disklabel *vl;
1121
1122		vl = getvirginlabel();
1123		lp->d_secsize = vl->d_secsize;
1124		lp->d_nsectors = vl->d_nsectors;
1125		lp->d_ntracks = vl->d_ntracks;
1126		lp->d_ncylinders = vl->d_ncylinders;
1127		lp->d_rpm = vl->d_rpm;
1128		lp->d_interleave = vl->d_interleave;
1129		lp->d_secpercyl = vl->d_secpercyl;
1130		lp->d_secperunit = vl->d_secperunit;
1131		lp->d_bbsize = vl->d_bbsize;
1132		lp->d_npartitions = vl->d_npartitions;
1133	}
1134
1135
1136	/* first allocate space to the partitions, then offsets */
1137	total_size = 0; /* in sectors */
1138	total_percent = 0; /* in percent */
1139	hog_part = -1;
1140	/* find all fixed partitions */
1141	for (i = 0; i < lp->d_npartitions; i++) {
1142		pp = &lp->d_partitions[i];
1143		if (part_set[i]) {
1144			if (part_size_type[i] == '*') {
1145				if (i == RAW_PART) {
1146					pp->p_size = lp->d_secperunit;
1147				} else {
1148					if (hog_part != -1)
1149						warnx("Too many '*' partitions (%c and %c)",
1150						    hog_part + 'a',i + 'a');
1151					else
1152						hog_part = i;
1153				}
1154			} else {
1155				off_t size;
1156
1157				size = pp->p_size;
1158				switch (part_size_type[i]) {
1159				case '%':
1160					total_percent += size;
1161					break;
1162				case 't':
1163				case 'T':
1164					size *= 1024ULL;
1165					/* FALLTHROUGH */
1166				case 'g':
1167				case 'G':
1168					size *= 1024ULL;
1169					/* FALLTHROUGH */
1170				case 'm':
1171				case 'M':
1172					size *= 1024ULL;
1173					/* FALLTHROUGH */
1174				case 'k':
1175				case 'K':
1176					size *= 1024ULL;
1177					break;
1178				case '\0':
1179					break;
1180				default:
1181					warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1182					    part_size_type[i], i + 'a');
1183					break;
1184				}
1185				/* don't count %'s yet */
1186				if (part_size_type[i] != '%') {
1187					/*
1188					 * for all not in sectors, convert to
1189					 * sectors
1190					 */
1191					if (part_size_type[i] != '\0') {
1192						if (size % lp->d_secsize != 0)
1193							warnx("partition %c not an integer number of sectors",
1194							    i + 'a');
1195						size /= lp->d_secsize;
1196						pp->p_size = size;
1197					}
1198					/* else already in sectors */
1199					if (i != RAW_PART)
1200						total_size += size;
1201				}
1202			}
1203		}
1204	}
1205
1206	/* Find out the total free space, excluding the boot block area. */
1207	base_offset = BBSIZE / secsize;
1208	free_space = 0;
1209	for (i = 0; i < lp->d_npartitions; i++) {
1210		pp = &lp->d_partitions[i];
1211		if (!part_set[i] || i == RAW_PART ||
1212		    part_size_type[i] == '%' || part_size_type[i] == '*')
1213			continue;
1214		if (pp->p_offset > base_offset)
1215			free_space += pp->p_offset - base_offset;
1216		if (pp->p_offset + pp->p_size > base_offset)
1217			base_offset = pp->p_offset + pp->p_size;
1218	}
1219	if (base_offset < lp->d_secperunit)
1220		free_space += lp->d_secperunit - base_offset;
1221
1222	/* handle % partitions - note %'s don't need to add up to 100! */
1223	if (total_percent != 0) {
1224		if (total_percent > 100) {
1225			fprintf(stderr,"total percentage %lu is greater than 100\n",
1226			    total_percent);
1227			errors++;
1228		}
1229
1230		if (free_space > 0) {
1231			for (i = 0; i < lp->d_npartitions; i++) {
1232				pp = &lp->d_partitions[i];
1233				if (part_set[i] && part_size_type[i] == '%') {
1234					/* careful of overflows! and integer roundoff */
1235					pp->p_size = ((double)pp->p_size/100) * free_space;
1236					total_size += pp->p_size;
1237
1238					/* FIX we can lose a sector or so due to roundoff per
1239					   partition.  A more complex algorithm could avoid that */
1240				}
1241			}
1242		} else {
1243			fprintf(stderr,
1244			    "%ld sectors available to give to '*' and '%%' partitions\n",
1245			    free_space);
1246			errors++;
1247			/* fix?  set all % partitions to size 0? */
1248		}
1249	}
1250	/* give anything remaining to the hog partition */
1251	if (hog_part != -1) {
1252		/*
1253		 * Find the range of offsets usable by '*' partitions around
1254		 * the hog partition and how much space they need.
1255		 */
1256		needed = 0;
1257		base_offset = BBSIZE / secsize;
1258		for (i = hog_part - 1; i >= 0; i--) {
1259			pp = &lp->d_partitions[i];
1260			if (!part_set[i] || i == RAW_PART)
1261				continue;
1262			if (part_offset_type[i] == '*') {
1263				needed += pp->p_size;
1264				continue;
1265			}
1266			base_offset = pp->p_offset + pp->p_size;
1267			break;
1268		}
1269		current_offset = lp->d_secperunit;
1270		for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1271			pp = &lp->d_partitions[i];
1272			if (!part_set[i] || i == RAW_PART)
1273				continue;
1274			if (part_offset_type[i] == '*') {
1275				needed += pp->p_size;
1276				continue;
1277			}
1278			current_offset = pp->p_offset;
1279		}
1280
1281		if (current_offset - base_offset <= needed) {
1282			fprintf(stderr, "Cannot find space for partition %c\n",
1283			    hog_part + 'a');
1284			fprintf(stderr,
1285			    "Need more than %lu sectors between %lu and %lu\n",
1286			    needed, base_offset, current_offset);
1287			errors++;
1288			lp->d_partitions[hog_part].p_size = 0;
1289		} else {
1290			lp->d_partitions[hog_part].p_size = current_offset -
1291			    base_offset - needed;
1292			total_size += lp->d_partitions[hog_part].p_size;
1293		}
1294	}
1295
1296	/* Now set the offsets for each partition */
1297	current_offset = BBSIZE / secsize; /* in sectors */
1298	seen_default_offset = 0;
1299	for (i = 0; i < lp->d_npartitions; i++) {
1300		part = 'a' + i;
1301		pp = &lp->d_partitions[i];
1302		if (part_set[i]) {
1303			if (part_offset_type[i] == '*') {
1304				if (i == RAW_PART) {
1305					pp->p_offset = 0;
1306				} else {
1307					pp->p_offset = current_offset;
1308					seen_default_offset = 1;
1309				}
1310			} else {
1311				/* allow them to be out of order for old-style tables */
1312				if (pp->p_offset < current_offset &&
1313				    seen_default_offset && i != RAW_PART &&
1314				    pp->p_fstype != FS_VINUM) {
1315					fprintf(stderr,
1316"Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1317					    (long)pp->p_offset,i+'a',current_offset);
1318					fprintf(stderr,
1319"Labels with any *'s for offset must be in ascending order by sector\n");
1320					errors++;
1321				} else if (pp->p_offset != current_offset &&
1322				    i != RAW_PART && seen_default_offset) {
1323					/*
1324					 * this may give unneeded warnings if
1325					 * partitions are out-of-order
1326					 */
1327					warnx(
1328"Offset %ld for partition %c doesn't match expected value %ld",
1329					    (long)pp->p_offset, i + 'a', current_offset);
1330				}
1331			}
1332			if (i != RAW_PART)
1333				current_offset = pp->p_offset + pp->p_size;
1334		}
1335	}
1336
1337	for (i = 0; i < lp->d_npartitions; i++) {
1338		part = 'a' + i;
1339		pp = &lp->d_partitions[i];
1340		if (pp->p_size == 0 && pp->p_offset != 0)
1341			warnx("partition %c: size 0, but offset %lu",
1342			    part, (u_long)pp->p_offset);
1343#ifdef notdef
1344		if (pp->p_size % lp->d_secpercyl)
1345			warnx("partition %c: size %% cylinder-size != 0",
1346			    part);
1347		if (pp->p_offset % lp->d_secpercyl)
1348			warnx("partition %c: offset %% cylinder-size != 0",
1349			    part);
1350#endif
1351		if (pp->p_offset > lp->d_secperunit) {
1352			fprintf(stderr,
1353			    "partition %c: offset past end of unit\n", part);
1354			errors++;
1355		}
1356		if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1357			fprintf(stderr,
1358			"partition %c: partition extends past end of unit\n",
1359			    part);
1360			errors++;
1361		}
1362		if (i == RAW_PART) {
1363			if (pp->p_fstype != FS_UNUSED)
1364				warnx("partition %c is not marked as unused!",part);
1365			if (pp->p_offset != 0)
1366				warnx("partition %c doesn't start at 0!",part);
1367			if (pp->p_size != lp->d_secperunit)
1368				warnx("partition %c doesn't cover the whole unit!",part);
1369
1370			if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1371			    (pp->p_size != lp->d_secperunit)) {
1372				warnx("An incorrect partition %c may cause problems for "
1373				    "standard system utilities",part);
1374			}
1375		}
1376
1377		/* check for overlaps */
1378		/* this will check for all possible overlaps once and only once */
1379		for (j = 0; j < i; j++) {
1380			pp2 = &lp->d_partitions[j];
1381			if (j != RAW_PART && i != RAW_PART &&
1382			    pp->p_fstype != FS_VINUM &&
1383			    pp2->p_fstype != FS_VINUM &&
1384			    part_set[i] && part_set[j]) {
1385				if (pp2->p_offset < pp->p_offset + pp->p_size &&
1386				    (pp2->p_offset + pp2->p_size > pp->p_offset ||
1387					pp2->p_offset >= pp->p_offset)) {
1388					fprintf(stderr,"partitions %c and %c overlap!\n",
1389					    j + 'a', i + 'a');
1390					errors++;
1391				}
1392			}
1393		}
1394	}
1395	for (; i < MAXPARTITIONS; i++) {
1396		part = 'a' + i;
1397		pp = &lp->d_partitions[i];
1398		if (pp->p_size || pp->p_offset)
1399			warnx("unused partition %c: size %d offset %lu",
1400			    'a' + i, pp->p_size, (u_long)pp->p_offset);
1401	}
1402	return (errors);
1403}
1404
1405/*
1406 * When operating on a "virgin" disk, try getting an initial label
1407 * from the associated device driver.  This might work for all device
1408 * drivers that are able to fetch some initial device parameters
1409 * without even having access to a (BSD) disklabel, like SCSI disks,
1410 * most IDE drives, or vn devices.
1411 *
1412 * The device name must be given in its "canonical" form.
1413 */
1414static struct disklabel *
1415getvirginlabel(void)
1416{
1417	static struct disklabel loclab;
1418	struct partition *dp;
1419	int f;
1420	u_int u;
1421
1422	if ((f = open(specname, O_RDONLY)) == -1) {
1423		warn("cannot open %s", specname);
1424		return (NULL);
1425	}
1426
1427	if (is_file)
1428		get_file_parms(f);
1429	else if ((ioctl(f, DIOCGMEDIASIZE, &mediasize) != 0) ||
1430	    (ioctl(f, DIOCGSECTORSIZE, &secsize) != 0)) {
1431		close (f);
1432		return (NULL);
1433	}
1434	memset(&loclab, 0, sizeof loclab);
1435	loclab.d_magic = DISKMAGIC;
1436	loclab.d_magic2 = DISKMAGIC;
1437	loclab.d_secsize = secsize;
1438	loclab.d_secperunit = mediasize / secsize;
1439
1440	/*
1441	 * Nobody in these enligthened days uses the CHS geometry for
1442	 * anything, but nontheless try to get it right.  If we fail
1443	 * to get any good ideas from the device, construct something
1444	 * which is IBM-PC friendly.
1445	 */
1446	if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1447		loclab.d_nsectors = u;
1448	else
1449		loclab.d_nsectors = 63;
1450	if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1451		loclab.d_ntracks = u;
1452	else if (loclab.d_secperunit <= 63*1*1024)
1453		loclab.d_ntracks = 1;
1454	else if (loclab.d_secperunit <= 63*16*1024)
1455		loclab.d_ntracks = 16;
1456	else
1457		loclab.d_ntracks = 255;
1458	loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1459	loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1460	loclab.d_npartitions = MAXPARTITIONS;
1461
1462	/* Various (unneeded) compat stuff */
1463	loclab.d_rpm = 3600;
1464	loclab.d_bbsize = BBSIZE;
1465	loclab.d_interleave = 1;
1466	strncpy(loclab.d_typename, "amnesiac",
1467	    sizeof(loclab.d_typename));
1468
1469	dp = &loclab.d_partitions[RAW_PART];
1470	dp->p_size = loclab.d_secperunit;
1471	loclab.d_checksum = dkcksum(&loclab);
1472	close (f);
1473	return (&loclab);
1474}
1475
1476static void
1477usage(void)
1478{
1479
1480	fprintf(stderr,
1481	"%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1482	"usage: bsdlabel disk",
1483	"\t\t(to read label)",
1484	"	bsdlabel -w [-n] [-m machine] disk [type]",
1485	"\t\t(to write label with existing boot program)",
1486	"	bsdlabel -e [-n] [-m machine] disk",
1487	"\t\t(to edit label)",
1488	"	bsdlabel -R [-n] [-m machine] disk protofile",
1489	"\t\t(to restore label with existing boot program)",
1490	"	bsdlabel -B [-b boot] [-m machine] disk",
1491	"\t\t(to install boot program with existing on-disk label)",
1492	"	bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1493	"\t\t(to write label and install boot program)",
1494	"	bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1495		"\t\t(to restore label and install boot program)"
1496	);
1497	exit(1);
1498}
1499